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Dislocation dissociations in C11.sub.b./sub. MoSi.sub.2./sub. and their impact on its plastic deformation
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SYSNO ASEP 0490262 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Dislocation dissociations in C11.sub/sub. MoSi2 and their impact on its plastic deformation Author(s) Paidar, Václav (FZU-D) RID, ORCID
Čák, M. (DE)
Šob, Mojmír (UFM-A) RID, ORCID
Vitek, V. (US)Number of authors 4 Source Title Intermetallics. - : Elsevier - ISSN 0966-9795
Roč. 97, Jun (2018), s. 34-41Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords hexagonal metals ; mechanical properties ; twinning Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects GA16-14599S GA ČR - Czech Science Foundation (CSF) GA16-24711S GA ČR - Czech Science Foundation (CSF) LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support FZU-D - RVO:68378271 ; UFM-A - RVO:68081723 UT WOS 000433016500006 EID SCOPUS 85044859710 DOI 10.1016/j.intermet.2018.03.003 Annotation Using the DFT calculated gamma-surfaces possible metastable stacking faults have been found for the most common slip planes {013) and {110) in MoSi2. These calculations reveal three distinct stacking faults on {013) planes and one stacking fault on {110) plane. Owing to such multiplicity of metastable stacking faults there is a large number of possible dislocation dissociations. These dislocation splittings are analysed using the anisotropic elasticity and relevant stacking faults. The results show that the only dissociations of the < 331] dislocations favoured over the complete undissociated dislocations are on {013) planes either in one or two planes of this type. Splitting into {110) planes are never favoured. For the screw dislocation the dissociations on {013) planes lead to configurations that are sessile and block the dislocations glide in the case of compression along the [001] axis. This explains why for this orientation of compressive axis the single crystals are brittle at ambient temperature but dislocation glide may occur for compressive loading along different, less symmetrical directions. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2019
Number of the records: 1